CHALLENGER'S LOST LESSONS - ER - NASA

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72force is indirectly applied to an object of mass to directly movingthe object is known as the mechanical advantage of a simple orcompound machine. Simply put: mechanical advantage is theexchange of force for distance.Again, an example is helpful. Lifting a one pound weightvertically without the help of a machine indicates a mechanicaladvantage of one, i.e., nothing is gained to help lift the weightHowever, if one pushes that same block up an inclined plane (aramp) which reaches the same height as lifting the weight vertically,the force needed is proportionally less based on the length of theincline. If a one pound weight is lifted vertically one foot, it wouldrequire a pound of force to move the weight one foot. A “footpound”of work is done..Using a ramp (inclined plane) which is two foot long and afoot tall requires approximately half as much force to reach the onefoot elevation. This is true even though the weight moved two feetinstead of one foot vertically. Mathematically, a half pound of forcewas applied for two feet. Therefore, .5 pounds of applied forcetimes two feet amounts to a foot pound of work. Equal amounts ofwork are done in both cases even though the second case requiredhalf the force. The mechanical advantage of the ramp is two.Of course, the force needed to overcome the resisting frictionof the weight sliding against the ramp surface has been ignored. Iftaken into account for the ramp, greater work would have beenrequired than a foot pound. The example gives the ideal mechanicaladvantage not the actual mechanical advantage. Such is the casewhen losses are ignored from friction, air resistance and other forces.Materials:1) An inclined block of wood, 2” wide by 3” high with a 10”long incline (cut from a building framing wood stud) orsimply use a board as seen below with one end propped onthe edge of a chair2) A matchbook car with less than a two inch wheelbase.
733) A screwdriver and wood screws.4) A hammer and nail5) A pair of pulleys.6) cord7) A spring scale to measure weight or applied force.
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CHALLENGER’S LOST LESSONSProject
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9Hydroponics ChamberAnother aspect
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11been ingested by crewmembers or e
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13of the mass of each other. This w
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15effervescent tablet, and a water
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19with an insert to provide frictio
Page 21 and 22: 21Challenger’s Live Lost LessonsW
Page 23 and 24: 23[For a preliminary or concluding
Page 25 and 26: 25THE LOST HYDROPONICS CHAMBER LESS
Page 27 and 28: 27Hold down CTRL Key and click here
Page 29 and 30: 29i.e., the leaves may simply droop
Page 31 and 32: 31After each daily spraying of the
Page 33 and 34: 332. What impact would ambient ligh
Page 35 and 36: 35Christa Practicing Bar Magnet in
Page 37 and 38: 37Observe the movement of the right
Page 39 and 40: 39would permit filming. The movie w
Page 41 and 42: 41What Happened?(Study the video ta
Page 43 and 44: 43How do you believe Christa’s su
Page 45 and 46: 45the final lines of force pattern.
Page 47 and 48: 47permanent magnet.)The assembly of
Page 49 and 50: 49THE LOST NEWTON’S LAWS LESSON
Page 51 and 52: 51Such an experiment reminds educat
Page 53 and 54: 53equal for both projectiles. Cups
Page 55 and 56: 55Process:Cutaway view of spring re
Page 57 and 58: 57Questions to Answer:1. What did y
Page 59 and 60: 59THE LOST EFFERVESCENCE LESSONThe
Page 61 and 62: 61dioxide. The gas was contained in
Page 63 and 64: 63THE LOST CHROMATOGRAPHY LESSON“
Page 65 and 66: 65Hold down CTRL Key and click on:c
Page 67 and 68: 67of Christa to see how her apparat
Page 69 and 70: 69THE LOST SIMPLE MACHINES LESSONIn
Page 71: 71station actually has a trolley ty
Page 75 and 76: 75*3. Hammer a nail lightly into th
Page 77 and 78: 77What Would Have Happened on Chall
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Page 81 and 82: 81The “The Ultimate Field Trip”
Page 83 and 84: 834. If you were to teach the seven
Page 85 and 86: 85Unlike, the first live lesson whi
Page 87 and 88: 87Concerning the tripod, Pilot Mike
Page 89 and 90: 89A Classroom Version of Christa’
Page 91 and 92: 91easily done in the KC-135 aircraf
Page 93 and 94: 93and gaseous substances on earth a
Page 95 and 96: 95Wright Brothers’ AirplaneIntern
Page 97: 97Instructions for using the attach
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CHALLENGER'S LOST LESSONS - ER - NASA

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